Warning system for dozing at wheel
US4586032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1982 |
| Grant date | Apr 29, 1986 |
| Priority date | — |
| Expiry date | May 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A doze warning system has a circuit 20 for producing pulse signals representative of left- and right-hand steering angle variations, circuits 30 and 40 counting the pulse signal and producing a warning signal when the counter value reaches a threshold value, and a circuit 60 for producing a reset signal to clear the counter value when a difference between a number of pulse signals representative of the left-hand steering angle variations and a number of pulse signals representative of the right-hand steering angle variations exceeds a given value, or of a condition wherein the left-hand or right-hand pulse signals inputted exceeds a predetermined pulse number. The reset signal generating circuit detects a steering angle variation in excess of the threshold value in a normal driving condition such as passing through a curved road and produces the reset signal to inhibit production of the warning. By this reset signal generating circuit function, the warning system is prevented from malfunctioning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.